METHOD OF MAKING BALL STUDS FROM METAL RODS
First Claim
1. A method of making a ball stud from a metal rod, comprising the steps of:
- 1. cutting from said metal rod, a blank having generally the same volume and outer diameter as that of a finished ball stud, 2. forwardly extruding one end of said blank positioned within a die cavity to form a taper, stem and shank portions, 3. forming a preliminary cylindrical shape with a shallow cavity on the other end of said blank, the diameter of said preliminary cylindrical portion being smaller than the outer diameter of a finished spherical head, 4. backwardly extruding said other end to form a preliminary cylindrical shape having a wall of generally the same thickness as that of a finished spherical head portion, and 5. upsetting said preliminary cylindrical shape to form a spherical hollow head portion in the die cavity.
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Abstract
A method of making a ball stud from a metal rod, comprising the steps of cutting from the metal rod, a blank having generally the same volume and outer diameter as that of a finished ball stud, forwardly extruding one end of the blank positioned within a die cavity to form a taper, stem and shank portions, forming a preliminary cylindrical shape with a shallow cavity on the other end of the blank, the diameter of said preliminary cylindrical portion being smaller than the outer diameter of a finished spherical head, backwardly extruding the other end to form a preliminary cylindrical shape having a wall of generally the same thickness as that of a finished spherical head portion, and upsetting the preliminary cylindrical shape to form a spherical hollow head portion in the die cavity, whereby the upsetting operation is achieved with an application of a mixture of oil and air to pressurize the inner space of the spherical hollow head portion.
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Citations
5 Claims
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1. A method of making a ball stud from a metal rod, comprising the steps of:
- 1. cutting from said metal rod, a blank having generally the same volume and outer diameter as that of a finished ball stud, 2. forwardly extruding one end of said blank positioned within a die cavity to form a taper, stem and shank portions, 3. forming a preliminary cylindrical shape with a shallow cavity on the other end of said blank, the diameter of said preliminary cylindrical portion being smaller than the outer diameter of a finished spherical head, 4. backwardly extruding said other end to form a preliminary cylindrical shape having a wall of generally the same thickness as that of a finished spherical head portion, and 5. upsetting said preliminary cylindrical shape to form a spherical hollow head portion in the die cavity.
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2. A method of making ball studs as specified in claim 1 wherein the upsetting operation comprises the step of applying a mixture of oil and air into the cavity of the head portion to pressurize the inner space of the spherical hollow head portion.
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3. forming a preliminary cylindrical shape with a shallow cavity on the other end of said blank, the diameter of said preliminary cylindrical portion being smaller than the outer diameter of a finished spherical head,
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4. A method of making a ball stud from a metal rod, comprising the steps of:
- cutting from said metal rod, a blank having generally the same volume and outer diameter as that of a finished ball stud, forwardly extruding one end of said blank positioned within a die cavity to form a taper, stem and shank portions, forming a preliminary cylindrical shape with a shallow cavity on the other end of said blank, the diameter of said preliminary cylindrical portion being smaller than the outer diameter of a finished spherical head, backwardly extruding said other end to form a preliminary cylindrical shape having a wall of generally the same thickness as that of a finished spherical head portion, and upsetting said preliminary cylindrical shape to form a spherical hollow head portion in the die cavity and to leave a relatively small top hole at the upper end of the finished spherical head.
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5. upsetting said preliminary cylindrical shape to form a spherical hollow head portion in the die cavity.
Specification